ES8801320A1 - Amino acid derivatives, process for their preparation and pharmaceutical compositions. - Google Patents

Abstract

The amino acid derivatives have the general formula < IMAGE > in which R<1> is H, acetyl, benzoyl, pivaloyl or the radical < IMAGE > P is one of the numbers 1-4 A is a residue of one of the alpha -amino acids < IMAGE > or < IMAGE > R2 is hydrogen, C1-C4-alkyl, straight-chain or branched, C5-C7-cycloalkyl, it being possible for a phenyl ring to be fused on, phenyl, phenyl-C1-C4-alkyl, a hetero-C1-C4-alkyl radical where the heterocycle consists of a 5- or 6-membered ring with 1-2 of the hetero atoms O, S or N, R3 is hydrogen, C1-C4-alkyl, straight-chain or branched, phenyl, phenyl-C1-C4-alkyl or a hetero-C1-C4-alkyl radical where the heterocycle consists of a 5- or 6-membered ring with 1-2of the hetero atoms O, S or N, or R2 and R3 together form with the N and the C atom a 5-, 6- or 7-membered ring which can be saturated or contain one double bond, or a 4-, 5- or 6-membered ring which contains one or more of the hetero atoms O, S or N R4 is OH, C1-C4- omega -hydroxyalkyl, C1-C4-alkoxy, phenyl-C1-C4-alkoxy, C1-C4-alkylamino, (C1-C4)2-dialkylamino, one of the groups < IMAGE > or an alpha -amino acid which is linked in the manner of a peptide to the CO group of the molecule R5 is C1-C4-alkyl, C1-C3-alkenyl, C1-C3-alkynyl, straight-chain or branched, hydroxyl, nitro, amino, C1-C4-alkoxy, mercapto, C1-C4- alkylthio, hydroxy-C1-C4-alkyl, mercapto-C1-C4-alkyl, F, Cl, Br, amino-C1-C4-alkyl, sulphonamido, methylenedioxy, fluoro-C1-C4-alkyl, chloro-C1-C4-alkyl, bromo-C1-C4-alkyl, cyano or trifluoromethyl R6 is hydrogen or methyl R7 is C1-C4-alkyl, straight-chain or branched, where the alkyl radical can be substituted by F, Cl, Br, CF3, phenyl or pyridyl X, Y and Z are O, S, NR8, CR9, CHR9, < IMAGE > with the proviso that only one of the radicals X, Y and Z can be O, S, < IMAGE > and one or two of the radicals X, Y and Z can be NR8 R8 is hydrogen or C1-C4-alkyl, straight-chain or branched R9 is hydrogen or, together with a vicinal radical R9, a phenyl ring or, for m and n = 1, the dihydro form thereof with double bond in conjugation with the C-terminal carboxyl group and m and n are each 0, 1 or 2, where the total of m and n is 1 or 2. The compounds are strong inhibitors of angiotensin I converting enzyme and are intended for use as hypotensive agents.